#include <dirent.h>
#include "cache.h"
#include "delta.h"
+#include "pack.h"
#ifndef O_NOATIME
#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
static unsigned long pack_mapped;
struct packed_git *packed_git;
-struct pack_entry {
- unsigned int offset;
- unsigned char sha1[20];
- struct packed_git *p;
-};
-
static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
void **idx_map_)
{
return -1;
index = idx_map;
+ *idx_map_ = idx_map;
+ *idx_size_ = idx_size;
/* check index map */
- if (idx_size < 4*256 + 20)
+ if (idx_size < 4*256 + 20 + 20)
return error("index file too small");
nr = 0;
for (i = 0; i < 256; i++) {
if (idx_size != 4*256 + nr * 24 + 20 + 20)
return error("wrong index file size");
- *idx_map_ = idx_map;
- *idx_size_ = idx_size;
return 0;
}
-static void unuse_one_packed_git(void)
+static int unuse_one_packed_git(void)
{
- /* NOTYET */
+ struct packed_git *p, *lru = NULL;
+
+ for (p = packed_git; p; p = p->next) {
+ if (p->pack_use_cnt || !p->pack_base)
+ continue;
+ if (!lru || p->pack_last_used < lru->pack_last_used)
+ lru = p;
+ }
+ if (!lru)
+ return 0;
+ munmap(lru->pack_base, lru->pack_size);
+ lru->pack_base = NULL;
+ return 1;
}
-static int use_packed_git(struct packed_git *p)
+void unuse_packed_git(struct packed_git *p)
+{
+ p->pack_use_cnt--;
+}
+
+int use_packed_git(struct packed_git *p)
{
if (!p->pack_base) {
int fd;
void *map;
pack_mapped += p->pack_size;
- while (PACK_MAX_SZ < pack_mapped)
- unuse_one_packed_git();
+ while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
+ ; /* nothing */
fd = open(p->pack_name, O_RDONLY);
if (fd < 0)
- return -1;
+ die("packfile %s cannot be opened", p->pack_name);
if (fstat(fd, &st)) {
close(fd);
- return -1;
+ die("packfile %s cannot be opened", p->pack_name);
}
if (st.st_size != p->pack_size)
- return -1;
+ die("packfile %s size mismatch.", p->pack_name);
map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (map == MAP_FAILED)
- return -1;
+ die("packfile %s cannot be mapped.", p->pack_name);
p->pack_base = map;
+
+ /* Check if the pack file matches with the index file.
+ * this is cheap.
+ */
+ if (memcmp((char*)(p->index_base) + p->index_size - 40,
+ p->pack_base + p->pack_size - 20, 20))
+ die("packfile %s does not match index.", p->pack_name);
}
p->pack_last_used = pack_used_ctr++;
+ p->pack_use_cnt++;
return 0;
}
-static struct packed_git *add_packed_git(char *path, int path_len)
+struct packed_git *add_packed_git(char *path, int path_len)
{
struct stat st;
struct packed_git *p;
p->pack_size = st.st_size;
p->index_base = idx_map;
p->next = NULL;
+ p->pack_base = NULL;
p->pack_last_used = 0;
+ p->pack_use_cnt = 0;
return p;
}
return inflate(stream, 0);
}
-void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
+static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
{
int bytes = strlen(buffer) + 1;
unsigned char *buf = xmalloc(1+size);
return unpack_sha1_rest(&stream, hdr, *size);
}
+/* forward declaration for a mutually recursive function */
+static int packed_object_info(struct pack_entry *entry,
+ char *type, unsigned long *sizep);
+
static int packed_delta_info(unsigned char *base_sha1,
unsigned long delta_size,
unsigned long left,
char *type,
- unsigned long *sizep)
+ unsigned long *sizep,
+ struct packed_git *p)
{
- unsigned char *data;
- unsigned char delta_head[64];
- int i;
- unsigned char cmd;
- unsigned long data_size, result_size, base_size, verify_base_size;
- z_stream stream;
- int st;
+ struct pack_entry base_ent;
if (left < 20)
die("truncated pack file");
- if (sha1_object_info(base_sha1, type, &base_size))
- die("cannot get info for delta-pack base");
- data = base_sha1 + 20;
- data_size = left - 20;
+ /* The base entry _must_ be in the same pack */
+ if (!find_pack_entry_one(base_sha1, &base_ent, p))
+ die("failed to find delta-pack base object %s",
+ sha1_to_hex(base_sha1));
- memset(&stream, 0, sizeof(stream));
+ /* We choose to only get the type of the base object and
+ * ignore potentially corrupt pack file that expects the delta
+ * based on a base with a wrong size. This saves tons of
+ * inflate() calls.
+ */
- stream.next_in = data;
- stream.avail_in = data_size;
- stream.next_out = delta_head;
- stream.avail_out = sizeof(delta_head);
+ if (packed_object_info(&base_ent, type, NULL))
+ die("cannot get info for delta-pack base");
- inflateInit(&stream);
- st = inflate(&stream, Z_FINISH);
- inflateEnd(&stream);
- if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head))
- die("delta data unpack-initial failed");
+ if (sizep) {
+ const unsigned char *data;
+ unsigned char delta_head[64];
+ unsigned long result_size;
+ z_stream stream;
+ int st;
+
+ memset(&stream, 0, sizeof(stream));
+
+ data = stream.next_in = base_sha1 + 20;
+ stream.avail_in = left - 20;
+ stream.next_out = delta_head;
+ stream.avail_out = sizeof(delta_head);
+
+ inflateInit(&stream);
+ st = inflate(&stream, Z_FINISH);
+ inflateEnd(&stream);
+ if ((st != Z_STREAM_END) &&
+ stream.total_out != sizeof(delta_head))
+ die("delta data unpack-initial failed");
+
+ /* Examine the initial part of the delta to figure out
+ * the result size.
+ */
+ data = delta_head;
+ get_delta_hdr_size(&data); /* ignore base size */
- /* Examine the initial part of the delta to figure out
- * the result size. Verify the base size while we are at it.
- */
- data = delta_head;
- verify_base_size = i = 0;
- cmd = *data++;
- while (cmd) {
- if (cmd & 1)
- verify_base_size |= *data++ << i;
- i += 8;
- cmd >>= 1;
+ /* Read the result size */
+ result_size = get_delta_hdr_size(&data);
+ *sizep = result_size;
}
+ return 0;
+}
- /* Read the result size */
- result_size = i = 0;
- cmd = *data++;
- while (cmd) {
- if (cmd & 1)
- result_size |= *data++ << i;
- i += 8;
- cmd >>= 1;
+static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
+ enum object_type *type, unsigned long *sizep)
+{
+ unsigned shift;
+ unsigned char *pack, c;
+ unsigned long size;
+
+ if (offset >= p->pack_size)
+ die("object offset outside of pack file");
+
+ pack = p->pack_base + offset;
+ c = *pack++;
+ offset++;
+ *type = (c >> 4) & 7;
+ size = c & 15;
+ shift = 4;
+ while (c & 0x80) {
+ if (offset >= p->pack_size)
+ die("object offset outside of pack file");
+ c = *pack++;
+ offset++;
+ size += (c & 0x7f) << shift;
+ shift += 7;
}
- if (verify_base_size != base_size)
- die("delta base size mismatch");
+ *sizep = size;
+ return offset;
+}
- *sizep = result_size;
- return 0;
+void packed_object_info_detail(struct pack_entry *e,
+ char *type,
+ unsigned long *size,
+ unsigned long *store_size,
+ int *delta_chain_length,
+ unsigned char *base_sha1)
+{
+ struct packed_git *p = e->p;
+ unsigned long offset, left;
+ unsigned char *pack;
+ enum object_type kind;
+
+ offset = unpack_object_header(p, e->offset, &kind, size);
+ pack = p->pack_base + offset;
+ left = p->pack_size - offset;
+ if (kind != OBJ_DELTA)
+ *delta_chain_length = 0;
+ else {
+ int chain_length = 0;
+ memcpy(base_sha1, pack, 20);
+ do {
+ struct pack_entry base_ent;
+ unsigned long junk;
+
+ find_pack_entry_one(pack, &base_ent, p);
+ offset = unpack_object_header(p, base_ent.offset,
+ &kind, &junk);
+ pack = p->pack_base + offset;
+ chain_length++;
+ } while (kind == OBJ_DELTA);
+ *delta_chain_length = chain_length;
+ }
+ switch (kind) {
+ case OBJ_COMMIT:
+ strcpy(type, "commit");
+ break;
+ case OBJ_TREE:
+ strcpy(type, "tree");
+ break;
+ case OBJ_BLOB:
+ strcpy(type, "blob");
+ break;
+ case OBJ_TAG:
+ strcpy(type, "tag");
+ break;
+ default:
+ die("corrupted pack file");
+ }
+ *store_size = 0; /* notyet */
}
static int packed_object_info(struct pack_entry *entry,
struct packed_git *p = entry->p;
unsigned long offset, size, left;
unsigned char *pack;
-
- offset = entry->offset;
- if (p->pack_size - 5 < offset)
- die("object offset outside of pack file");
+ enum object_type kind;
+ int retval;
if (use_packed_git(p))
die("cannot map packed file");
+ offset = unpack_object_header(p, entry->offset, &kind, &size);
pack = p->pack_base + offset;
- size = (pack[1] << 24) + (pack[2] << 16) + (pack[3] << 8) + pack[4];
- left = p->pack_size - offset - 5;
- switch (*pack) {
- case 'D':
- return packed_delta_info(pack+5, size, left, type, sizep);
- break;
- case 'C':
+ left = p->pack_size - offset;
+
+ switch (kind) {
+ case OBJ_DELTA:
+ retval = packed_delta_info(pack, size, left, type, sizep, p);
+ unuse_packed_git(p);
+ return retval;
+ case OBJ_COMMIT:
strcpy(type, "commit");
break;
- case 'T':
+ case OBJ_TREE:
strcpy(type, "tree");
break;
- case 'B':
+ case OBJ_BLOB:
strcpy(type, "blob");
break;
- case 'G':
+ case OBJ_TAG:
strcpy(type, "tag");
break;
default:
die("corrupted pack file");
}
- *sizep = size;
+ if (sizep)
+ *sizep = size;
+ unuse_packed_git(p);
return 0;
}
unsigned long delta_size,
unsigned long left,
char *type,
- unsigned long *sizep)
+ unsigned long *sizep,
+ struct packed_git *p)
{
+ struct pack_entry base_ent;
void *data, *delta_data, *result, *base;
unsigned long data_size, result_size, base_size;
z_stream stream;
if ((st != Z_STREAM_END) || stream.total_out != delta_size)
die("delta data unpack failed");
- /* This may recursively unpack the base, which is what we want */
- base = read_sha1_file(base_sha1, type, &base_size);
+ /* The base entry _must_ be in the same pack */
+ if (!find_pack_entry_one(base_sha1, &base_ent, p))
+ die("failed to find delta-pack base object %s",
+ sha1_to_hex(base_sha1));
+ base = unpack_entry_gently(&base_ent, type, &base_size);
if (!base)
die("failed to read delta-pack base object %s",
sha1_to_hex(base_sha1));
{
int st;
z_stream stream;
- char *buffer;
+ unsigned char *buffer;
buffer = xmalloc(size + 1);
buffer[size] = 0;
char *type, unsigned long *sizep)
{
struct packed_git *p = entry->p;
- unsigned long offset, size, left;
- unsigned char *pack;
-
- offset = entry->offset;
- if (p->pack_size - 5 < offset)
- die("object offset outside of pack file");
+ void *retval;
if (use_packed_git(p))
die("cannot map packed file");
+ retval = unpack_entry_gently(entry, type, sizep);
+ unuse_packed_git(p);
+ if (!retval)
+ die("corrupted pack file");
+ return retval;
+}
+
+/* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
+void *unpack_entry_gently(struct pack_entry *entry,
+ char *type, unsigned long *sizep)
+{
+ struct packed_git *p = entry->p;
+ unsigned long offset, size, left;
+ unsigned char *pack;
+ enum object_type kind;
+ void *retval;
+ offset = unpack_object_header(p, entry->offset, &kind, &size);
pack = p->pack_base + offset;
- size = (pack[1] << 24) + (pack[2] << 16) + (pack[3] << 8) + pack[4];
- left = p->pack_size - offset - 5;
- switch (*pack) {
- case 'D':
- return unpack_delta_entry(pack+5, size, left, type, sizep);
- case 'C':
+ left = p->pack_size - offset;
+ switch (kind) {
+ case OBJ_DELTA:
+ retval = unpack_delta_entry(pack, size, left, type, sizep, p);
+ return retval;
+ case OBJ_COMMIT:
strcpy(type, "commit");
break;
- case 'T':
+ case OBJ_TREE:
strcpy(type, "tree");
break;
- case 'B':
+ case OBJ_BLOB:
strcpy(type, "blob");
break;
- case 'G':
+ case OBJ_TAG:
strcpy(type, "tag");
break;
default:
- die("corrupted pack file");
+ return NULL;
}
*sizep = size;
- return unpack_non_delta_entry(pack+5, size, left);
+ retval = unpack_non_delta_entry(pack, size, left);
+ return retval;
}
int num_packed_objects(const struct packed_git *p)
{
- /* See check_packed_git_idx and pack-objects.c */
+ /* See check_packed_git_idx() */
return (p->index_size - 20 - 20 - 4*256) / 24;
}
return 0;
}
-static int find_pack_entry_1(const unsigned char *sha1,
- struct pack_entry *e, struct packed_git *p)
+int find_pack_entry_one(const unsigned char *sha1,
+ struct pack_entry *e, struct packed_git *p)
{
- int *level1_ofs = p->index_base;
+ unsigned int *level1_ofs = p->index_base;
int hi = ntohl(level1_ofs[*sha1]);
int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
void *index = p->index_base + 256;
prepare_packed_git();
for (p = packed_git; p; p = p->next) {
- if (find_pack_entry_1(sha1, e, p))
+ if (find_pack_entry_one(sha1, e, p))
return 1;
}
return 0;
if (!find_pack_entry(sha1, &e))
return error("unable to find %s", sha1_to_hex(sha1));
- if (!packed_object_info(&e, type, sizep))
- return 0;
- /* sheesh */
- map = unpack_entry(&e, type, sizep);
- free(map);
- return (map == NULL) ? 0 : -1;
+ return packed_object_info(&e, type, sizep);
}
if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
status = error("unable to unpack %s header",
status = error("unable to parse %s header", sha1_to_hex(sha1));
else {
status = 0;
- *sizep = size;
+ if (sizep)
+ *sizep = size;
}
inflateEnd(&stream);
munmap(map, mapsize);
return 0;
}
+int has_sha1_pack(const unsigned char *sha1)
+{
+ struct pack_entry e;
+ return find_pack_entry(sha1, &e);
+}
+
int has_sha1_file(const unsigned char *sha1)
{
struct stat st;